Estimation of detection probability in aerial surveys of Antarctic pack-ice seals
We use line transect detection functions together with generalized linear and additive models to estimate detection probability when detection on the line ("g(0)") may not be certain. The methods provide a flexible way of modeling detection probability for independent observer surveys, and...
Published in: | Journal of Agricultural, Biological, and Environmental Statistics |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2007
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/estimation-of-detection-probability-in-aerial-surveys-of-antarctic-packice-seals(cf05999b-2215-4701-9321-f59fca14b629).html https://doi.org/10.1198/108571107X162920 http://www.scopus.com/inward/record.url?scp=33947631839&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/cf05999b-2215-4701-9321-f59fca14b629 2024-06-23T07:47:57+00:00 Estimation of detection probability in aerial surveys of Antarctic pack-ice seals Southwell, C Borchers, David Louis Paxton, CGM Burt, Mary Louise de la Mare, W 2007-03 https://research-portal.st-andrews.ac.uk/en/researchoutput/estimation-of-detection-probability-in-aerial-surveys-of-antarctic-packice-seals(cf05999b-2215-4701-9321-f59fca14b629).html https://doi.org/10.1198/108571107X162920 http://www.scopus.com/inward/record.url?scp=33947631839&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/estimation-of-detection-probability-in-aerial-surveys-of-antarctic-packice-seals(cf05999b-2215-4701-9321-f59fca14b629).html info:eu-repo/semantics/restrictedAccess Southwell , C , Borchers , D L , Paxton , CGM , Burt , M L & de la Mare , W 2007 , ' Estimation of detection probability in aerial surveys of Antarctic pack-ice seals ' , Journal of Agricultural, Biological and Environmental Statistics , vol. 12 , no. 1 , pp. 41-54 . https://doi.org/10.1198/108571107X162920 generalized additive model generalized linear model heterogeneity line transect mark-recapture LINE TRANSECT SURVEYS POPULATIONS SIZE article 2007 ftunstandrewcris https://doi.org/10.1198/108571107X162920 2024-06-13T00:14:39Z We use line transect detection functions together with generalized linear and additive models to estimate detection probability when detection on the line ("g(0)") may not be certain. The methods provide a flexible way of modeling detection probability for independent observer surveys, and for investigating the effects of explanatory variables. Analysis of data from an aerial survey of pack-ice seals produced g (0) estimates substantially below I for some observers (it varied from 0.80 to 0.98), demonstrated a fairly complex dependence of detection probability on covariates, and showed negative correlation between observers' search width and their g(0). In addition to illustrating the utility of generalized additive models for capturing the effect of covariates on detection probability, the analysis suggests that detection functions may be sufficiently variable that use of g(0) correction factors obtained from other surveys would be inadvisable. We recommend that estimation of g(0) be considered for all aerial surveys; if g(0) is found to be very close to 1, estimation from subsequent surveys under the assumption that it is 1 may be reasonable, but without any estimation of g(0), the assumption that it is 1 is a matter of faith. Article in Journal/Newspaper Antarc* Antarctic University of St Andrews: Research Portal Antarctic Journal of Agricultural, Biological, and Environmental Statistics 12 1 41 54 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
generalized additive model generalized linear model heterogeneity line transect mark-recapture LINE TRANSECT SURVEYS POPULATIONS SIZE |
spellingShingle |
generalized additive model generalized linear model heterogeneity line transect mark-recapture LINE TRANSECT SURVEYS POPULATIONS SIZE Southwell, C Borchers, David Louis Paxton, CGM Burt, Mary Louise de la Mare, W Estimation of detection probability in aerial surveys of Antarctic pack-ice seals |
topic_facet |
generalized additive model generalized linear model heterogeneity line transect mark-recapture LINE TRANSECT SURVEYS POPULATIONS SIZE |
description |
We use line transect detection functions together with generalized linear and additive models to estimate detection probability when detection on the line ("g(0)") may not be certain. The methods provide a flexible way of modeling detection probability for independent observer surveys, and for investigating the effects of explanatory variables. Analysis of data from an aerial survey of pack-ice seals produced g (0) estimates substantially below I for some observers (it varied from 0.80 to 0.98), demonstrated a fairly complex dependence of detection probability on covariates, and showed negative correlation between observers' search width and their g(0). In addition to illustrating the utility of generalized additive models for capturing the effect of covariates on detection probability, the analysis suggests that detection functions may be sufficiently variable that use of g(0) correction factors obtained from other surveys would be inadvisable. We recommend that estimation of g(0) be considered for all aerial surveys; if g(0) is found to be very close to 1, estimation from subsequent surveys under the assumption that it is 1 may be reasonable, but without any estimation of g(0), the assumption that it is 1 is a matter of faith. |
format |
Article in Journal/Newspaper |
author |
Southwell, C Borchers, David Louis Paxton, CGM Burt, Mary Louise de la Mare, W |
author_facet |
Southwell, C Borchers, David Louis Paxton, CGM Burt, Mary Louise de la Mare, W |
author_sort |
Southwell, C |
title |
Estimation of detection probability in aerial surveys of Antarctic pack-ice seals |
title_short |
Estimation of detection probability in aerial surveys of Antarctic pack-ice seals |
title_full |
Estimation of detection probability in aerial surveys of Antarctic pack-ice seals |
title_fullStr |
Estimation of detection probability in aerial surveys of Antarctic pack-ice seals |
title_full_unstemmed |
Estimation of detection probability in aerial surveys of Antarctic pack-ice seals |
title_sort |
estimation of detection probability in aerial surveys of antarctic pack-ice seals |
publishDate |
2007 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/estimation-of-detection-probability-in-aerial-surveys-of-antarctic-packice-seals(cf05999b-2215-4701-9321-f59fca14b629).html https://doi.org/10.1198/108571107X162920 http://www.scopus.com/inward/record.url?scp=33947631839&partnerID=8YFLogxK |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Southwell , C , Borchers , D L , Paxton , CGM , Burt , M L & de la Mare , W 2007 , ' Estimation of detection probability in aerial surveys of Antarctic pack-ice seals ' , Journal of Agricultural, Biological and Environmental Statistics , vol. 12 , no. 1 , pp. 41-54 . https://doi.org/10.1198/108571107X162920 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/estimation-of-detection-probability-in-aerial-surveys-of-antarctic-packice-seals(cf05999b-2215-4701-9321-f59fca14b629).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1198/108571107X162920 |
container_title |
Journal of Agricultural, Biological, and Environmental Statistics |
container_volume |
12 |
container_issue |
1 |
container_start_page |
41 |
op_container_end_page |
54 |
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